Just like everything else, if that is all you have and you can shoot, yes it will kill an Elk. Partition or Barnes is hard to beat for this kind of use. That said, if you have other choices that are 338, more better solution. For one elk hunt I would use what I have, if I planned to do it regular I would get the right gun cause around here Elk country is also Grizz country and the sound of a shot is the dinner bell.Just wondering what others thoughts are on the 257 WBY with a 115 Partition on elk? Ok for cow? How about on a bull?